Reduce input lag by one frame by reading the controller at the correct place

libultraship/libultraship/Window.cpp

@@ -275,8 +275,11 @@ namespace Ship {
         WmApi->set_keyboard_callbacks(Window::KeyDown, Window::KeyUp, Window::AllKeysUp);
     }
 
-    void Window::RunCommands(Gfx* Commands) {
+    void Window::StartFrame() {
         gfx_start_frame();
+    }
+
+    void Window::RunCommands(Gfx* Commands) {
         gfx_run(Commands);
         gfx_end_frame();
     }

libultraship/libultraship/Window.h

@@ -18,6 +18,7 @@ namespace Ship {
 			~Window();
 			void MainLoop(void (*MainFunction)(void));
 			void Init();
+			void StartFrame();
 			void RunCommands(Gfx* Commands);
 			void SetFrameDivisor(int divisor);
 			void GetPixelDepthPrepare(float x, float y);

soh/soh/GbiWrap.cpp

@@ -5,6 +5,7 @@
 extern "C" {
 void InitOTR();
 void Graph_ProcessFrame(void (*run_one_game_iter)(void));
+void Graph_StartFrame();
 void Graph_ProcessGfxCommands(Gfx* commands);
 void OTRLogString(const char* src);
 void OTRGfxPrint(const char* str, void* printer, void (*printImpl)(void*, char));

soh/soh/OTRGlobals.cpp

@@ -92,6 +92,10 @@ extern "C" void Graph_ProcessFrame(void (*run_one_game_iter)(void)) {
     OTRGlobals::Instance->context->GetWindow()->MainLoop(run_one_game_iter);
 }
 
+extern "C" void Graph_StartFrame() {
+    OTRGlobals::Instance->context->GetWindow()->StartFrame();
+}
+
 // C->C++ Bridge
 extern "C" void Graph_ProcessGfxCommands(Gfx* commands) {
     OTRGlobals::Instance->context->GetWindow()->SetFrameDivisor(R_UPDATE_RATE);

soh/soh/OTRGlobals.h

@@ -21,6 +21,7 @@ private:
 #ifndef __cplusplus
 void InitOTR();
 void Graph_ProcessFrame(void (*run_one_game_iter)(void));
+void Graph_StartFrame();
 void Graph_ProcessGfxCommands(Gfx* commands);
 void OTRLogString(const char* src);
 void OTRGfxPrint(const char* str, void* printer, void (*printImpl)(void*, char));

soh/src/code/graph.c

@@ -472,6 +472,7 @@ static void RunFrame()
             uint64_t ticksA, ticksB;
             ticksA = GetPerfCounter();
             
+            Graph_StartFrame();
 
             PadMgr_ThreadEntry(&gPadMgr);